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VulnerabilityPublished Updated

CVE-2026-56744: @bsv/wallet-toolbox · Improper Validation of Consistency Within Input

Affects @bsv/wallet-toolboxSource CVE Database V5

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Not known to be exploited · CVSS 8.7 High : upgrade to 2.4.0 soon.

Data as of 6 Nov 2026, 23:24 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 32% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade @bsv/wallet-toolbox and @bsv/wallet-toolbox-client and @bsv/wallet-toolbox-mobile to 2.4.0.

Affected software

ProductAffectedFixed in
bsv-blockchain@bsv/wallet-toolboxAffected
  • >=1.1.47 <2.4.0
Fixed in
  • 2.4.0
bsv-blockchain@bsv/wallet-toolbox-clientAffected
  • >=1.1.47 <2.4.0
Fixed in
  • 2.4.0
bsv-blockchain@bsv/wallet-toolbox-mobileAffected
  • >=1.3.21 <2.4.0
Fixed in
  • 2.4.0

AI-suggested

A fix is available in version 2.4.0 of all affected packages. Users and applications should upgrade to version 2.4.0 or later. If upgrading is not possible, applications should avoid using remote StorageClient providers, use local storage solutions, or independently verify every transaction output’s locking script and value against the original request before signing to prevent unauthorized fund redirection.

Description

`@bsv/wallet-toolbox` provides BRC-100 wallet signing and storage components, while `@bsv/wallet-toolbox-client` and `@bsv/wallet-toolbox-mobile` provide client-focused distributions for standard and mobile applications using wallet storage services. A vulnerability in these packages causes transactions created through a remote `StorageClient` to trust output locking scripts returned by the storage provider without verifying that they match the outputs requested by the caller. A malicious or compromised storage provider can substitute a recipient script or inject an additional output, causing the wallet to sign and broadcast a transaction that redirects funds while the application and user interface continue to display the intended recipient. Source and npm publication history indicate that stable versions `@bsv/wallet-toolbox` and `@bsv/wallet-toolbox-client` from 1.1.47 through 2.3.3, and `@bsv/wallet-toolbox-mobile` from its initial 1.3.21 release through 2.3.3, are affected. All three packages are patched in version 2.4.0. Applications unable to upgrade should avoid remote `StorageClient` providers, use local storage, or independently verify every transaction output’s locking script and value against the original request before signing

References

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